
#include <stdio.h>
#include <string.h>


#include "track_fun_AES.h"


typedef unsigned char BOOL;


#define Nk    (AES_KEY_LENGTH / 32)        // �ԡ��֡���4�ֽڣ�Ϊ��λ����Կ����
#define Nb    4                            // �ԡ��֡���4�ֽڣ�Ϊ��λ�ļӽ������ݿ��С���̶�Ϊ4

// Nr�����ܵ�����
#if   AES_KEY_LENGTH == 128
#define Nr    10
#elif AES_KEY_LENGTH == 192
#define Nr	12
#elif AES_KEY_LENGTH == 256
#define Nr	14
#else
#error AES_KEY_LENGTH must be 128, 192 or 256 BOOLs!
#endif

// GF(28) ����ʽ
#define BPOLY 0x1B // Lower 8 BOOLs of (x^8 + x^4 + x^3 + x + 1), ie. (x^4 + x^3 + x + 1).


// AES����Կ������Կ����Ϊ128λʱ��ռ��176�ֽڿռ�
static unsigned char g_roundKeyTable[4 * Nb * (Nr + 1)];

// �����õ�SBox
static const unsigned char SBox[256] =
        {
                0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7,
                0xab, 0x76,
                0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4,
                0x72, 0xc0,
                0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8,
                0x31, 0x15,
                0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27,
                0xb2, 0x75,
                0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3,
                0x2f, 0x84,
                0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c,
                0x58, 0xcf,
                0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c,
                0x9f, 0xa8,
                0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff,
                0xf3, 0xd2,
                0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d,
                0x19, 0x73,
                0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e,
                0x0b, 0xdb,
                0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95,
                0xe4, 0x79,
                0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a,
                0xae, 0x08,
                0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd,
                0x8b, 0x8a,
                0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1,
                0x1d, 0x9e,
                0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55,
                0x28, 0xdf,
                0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54,
                0xbb, 0x16
        };

// �����õ�SBox
static const unsigned char InvSBox[256] =
        {
                0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3,
                0xd7, 0xfb,
                0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde,
                0xe9, 0xcb,
                0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa,
                0xc3, 0x4e,
                0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b,
                0xd1, 0x25,
                0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65,
                0xb6, 0x92,
                0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d,
                0x9d, 0x84,
                0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3,
                0x45, 0x06,
                0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13,
                0x8a, 0x6b,
                0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4,
                0xe6, 0x73,
                0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75,
                0xdf, 0x6e,
                0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18,
                0xbe, 0x1b,
                0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd,
                0x5a, 0xf4,
                0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80,
                0xec, 0x5f,
                0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9,
                0x9c, 0xef,
                0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53,
                0x99, 0x61,
                0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21,
                0x0c, 0x7d
        };


///////////////////////////////////////////////////////////////////////////////
//	��������	RotationWord
//	������		��һ�����֡����ݽ���ѭ�����ơ�
//	���������	pWord -- Ҫ���Ƶ�4�ֽ����ݡ�
//	���������	pWord -- ���ƺ��4�ֽ����ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void RotationWord(unsigned char *pWord) {
    unsigned char temp = pWord[0];
    pWord[0] = pWord[1];
    pWord[1] = pWord[2];
    pWord[2] = pWord[3];
    pWord[3] = temp;
}

///////////////////////////////////////////////////////////////////////////////
//	��������	XorBytes
//	������		��������������ݡ�
//	���������	pData1 -- Ҫ���ĵ�һ�����ݡ�
//				pData1 -- Ҫ���ĵڶ������ݡ�
//				nCount -- Ҫ�������ݳ��ȡ�
//	���������	pData1 -- ����Ľ����
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void XorBytes(unsigned char *pData1, const unsigned char *pData2, unsigned char nCount) {
    unsigned char i;

    for (i = 0; i < nCount; i++) {
        pData1[i] ^= pData2[i];
    }
}

///////////////////////////////////////////////////////////////////////////////
//	��������	AddRoundKey
//	������		�� �м�״̬���� ���ϣ��������Կ�����ݳ���Ϊ16�ֽڡ�
//	���������	pState	  -- ״̬���ݡ�
//				pRoundKey -- ����Կ���ݡ�
//	���������	pState	  -- ��������Կ���״̬���ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
// static void AddRoundKey(unsigned char *pState, const unsigned char *pRoundKey)
// {
// 	XorBytes(pState, pRoundKey, 4*Nb);
// }

// AddRoundKey�ĺ���ʽ���Ⱥ�����ʽ���Խ�ʡ4�ֽڵ�data����
#define AddRoundKey(pState, pRoundKey) \
    XorBytes((pState), (pRoundKey), 4*Nb)


///////////////////////////////////////////////////////////////////////////////
//	��������	SubBytes
//	������		ͨ��S�����û�״̬���ݡ�
//	���������	pState	-- ״̬���ݡ�
//				nCount  -- ״̬���ݳ��ȡ�
//				bInvert	-- �Ƿ�ʹ�÷���S���ӣ�����ʱʹ�ã���
//	���������	pState	-- �û����״̬���ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void SubBytes(unsigned char *pState, unsigned char nCount, BOOL bInvert) {
    unsigned char i;
    const unsigned char *pSBox = bInvert ? InvSBox : SBox;

    for (i = 0; i < nCount; i++) {
        pState[i] = pSBox[pState[i]];
    }
}

///////////////////////////////////////////////////////////////////////////////
//	��������	ShiftRows
//	������		��״̬�������С�
//	���������	pState	-- ״̬���ݡ�
//				bInvert	-- �Ƿ������У�����ʱʹ�ã���
//	���������	pState	-- ���к��״̬���ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void ShiftRows(unsigned char *pState, BOOL bInvert) {
    // ע�⣺״̬����������ʽ��ţ�
    unsigned char r;
    unsigned char c;
    unsigned char temp;
    unsigned char rowData[4];

    for (r = 1; r < 4; r++) {
        // ����һ������
        for (c = 0; c < 4; c++) {
            rowData[c] = pState[r + 4 * c];
        }

        temp = bInvert ? (4 - r) : r;
        for (c = 0; c < 4; c++) {
            pState[r + 4 * c] = rowData[(c + temp) % 4];
        }
    }
}

///////////////////////////////////////////////////////////////////////////////
//	��������	GfMultBy02
//	������		��GF(28)��� ��2 ���㡣
//	���������	num	-- ������
//	���������	�ޡ�
//	����ֵ��	num����2�Ľ����
///////////////////////////////////////////////////////////////////////////////
static unsigned char GfMultBy02(unsigned char num) {
    if ((num & 0x80) == 0) {
        num = num << 1;
    } else {
        num = (num << 1) ^ BPOLY;
    }

    return num;
}

///////////////////////////////////////////////////////////////////////////////
//	��������	MixColumns
//	������		���״̬�������ݡ�
//	���������	pState	-- ״̬���ݡ�
//				bInvert	-- �Ƿ����ϣ�����ʱʹ�ã���
//	���������	pState	-- ����к��״̬���ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void MixColumns(unsigned char *pState, BOOL bInvert) {
    unsigned char i;
    unsigned char temp;
    unsigned char a0Pa2_M4;    // 4(a0 + a2)
    unsigned char a1Pa3_M4;    // 4(a1 + a3)
    unsigned char result[4];

    for (i = 0; i < 4; i++, pState += 4) {
        // b0 = 2a0 + 3a1 + a2 + a3
        //    = (a0 + a1 + a2 + a3) + 2(a0 + a1) + a0

        temp = pState[0] ^ pState[1] ^ pState[2] ^ pState[3];
        result[0] = temp ^ pState[0] ^ GfMultBy02((unsigned char) (pState[0] ^ pState[1]));
        result[1] = temp ^ pState[1] ^ GfMultBy02((unsigned char) (pState[1] ^ pState[2]));
        result[2] = temp ^ pState[2] ^ GfMultBy02((unsigned char) (pState[2] ^ pState[3]));
        result[3] = temp ^ pState[3] ^ GfMultBy02((unsigned char) (pState[3] ^ pState[0]));

        if (bInvert) {
            // b0' = 14a0 + 11a1 + 13a2 + 9a3
            //     = (a0 + a1 + a2 + a3) + 2(a0 + a1) + a0	���ⲿ��Ϊb0��
            //       + 2(4(a0 + a2) + 4(a1 + a3))
            //       +   4(a0 + a2)

            a0Pa2_M4 = GfMultBy02(GfMultBy02((unsigned char) (pState[0] ^ pState[2])));
            a1Pa3_M4 = GfMultBy02(GfMultBy02((unsigned char) (pState[1] ^ pState[3])));
            temp = GfMultBy02((unsigned char) (a0Pa2_M4 ^ a1Pa3_M4));
            result[0] ^= temp ^ a0Pa2_M4;
            result[1] ^= temp ^ a1Pa3_M4;
            result[2] ^= temp ^ a0Pa2_M4;
            result[3] ^= temp ^ a1Pa3_M4;
        }

        memcpy(pState, result, 4);
    }
}

///////////////////////////////////////////////////////////////////////////////
//	��������	BlockEncrypt
//	������		�Ե������ݼ��ܡ�
//	���������	pState -- ״̬���ݡ�
//	���������	pState -- ���ܺ��״̬���ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void BlockEncrypt(unsigned char *pState) {
    unsigned char i;

    AddRoundKey(pState, g_roundKeyTable);

    for (i = 1; i <= Nr; i++)    // i = [1, Nr]
    {
        SubBytes(pState, 4 * Nb, 0);
        ShiftRows(pState, 0);

        if (i != Nr) {
            MixColumns(pState, 0);
        }

        AddRoundKey(pState, &g_roundKeyTable[4 * Nb * i]);
    }

// Ϊ�˽�ʡ���룬�ϲ���ѭ��ִ��
// 	SubBytes(pState, 4*Nb);
//	ShiftRows(pState, 0);
// 	AddRoundKey(pState, &g_roundKeyTable[4*Nb*Nr]);
}

///////////////////////////////////////////////////////////////////////////////
//	��������	BlockDecrypt
//	������		�Ե������ݽ��ܡ�
//	���������	pState -- ״̬���ݡ�
//	���������	pState -- ���ܺ��״̬���ݡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
static void BlockDecrypt(unsigned char *pState) {
    unsigned char i;

    AddRoundKey(pState, &g_roundKeyTable[4 * Nb * Nr]);

    for (i = Nr; i > 0; i--)    // i = [Nr, 1]
    {
        ShiftRows(pState, 1);
        SubBytes(pState, 4 * Nb, 1);
        AddRoundKey(pState, &g_roundKeyTable[4 * Nb * (i - 1)]);

        if (i != 1) {
            MixColumns(pState, 1);
        }
    }

// Ϊ�˽�ʡ���룬�ϲ���ѭ��ִ��
//  ShiftRows(pState, 1);
//  SubBytes(pState, 4*Nb, 1);
//  AddRoundKey(pState, g_roundKeyTable);
}

/*****************************************************************************
*  Global Functions                     ȫ�ֺ���
******************************************************************************/


///////////////////////////////////////////////////////////////////////////////
//	��������	AES_Init
//	������		��ʼ�����ڴ�ִ����չ��Կ������
//	���������	pKey -- ԭʼ��Կ���䳤�ȱ���Ϊ AES_KEY_LENGTH/8 �ֽڡ�
//	���������	�ޡ�
//	����ֵ��	�ޡ�
///////////////////////////////////////////////////////////////////////////////
void AES_Init(const void *pKey) {
    // ��չ��Կ
    unsigned char i;
    unsigned char *pRoundKey;
    unsigned char Rcon[4] = {0x01, 0x00, 0x00, 0x00};

    memcpy(g_roundKeyTable, pKey, 4 * Nk);

    pRoundKey = &g_roundKeyTable[4 * Nk];

    for (i = Nk; i < Nb * (Nr + 1); pRoundKey += 4, i++) {
        memcpy(pRoundKey, pRoundKey - 4, 4);

        if (i % Nk == 0) {
            RotationWord(pRoundKey);
            SubBytes(pRoundKey, 4, 0);
            XorBytes(pRoundKey, Rcon, 4);

            Rcon[0] = GfMultBy02(Rcon[0]);
        } else if (Nk > 6 && i % Nk == Nb) {
            SubBytes(pRoundKey, 4, 0);
        }

        XorBytes(pRoundKey, pRoundKey - 4 * Nk, 4);
    }
}

//////////////////////////////////////////////////////////////////////////
//	��������	AES_Encrypt
//	������		��������
//	���������	pPlainText	-- ���ģ�������ܵ����ݣ��䳤��ΪnDataLen�ֽڡ�
//				nDataLen	-- ���ݳ��ȣ����ֽ�Ϊ��λ������ΪAES_KEY_LENGTH/8����������
//				pIV			-- ��ʼ�����������ʹ��ECBģʽ������ΪNULL��
//	���������	pCipherText	-- ���ģ��������ļ��ܺ�����ݣ�������pPlainText��ͬ��
//	����ֵ��	�ޡ�
//////////////////////////////////////////////////////////////////////////
void AES_Encrypt(const unsigned char *pPlainText, unsigned char *pCipherText,
                 unsigned int nDataLen, const unsigned char *pIV) {
    unsigned int i;

    if (pPlainText != pCipherText) {
        memcpy(pCipherText, pPlainText, nDataLen);
    }

    for (i = nDataLen / (4 * Nb); i > 0; i--, pCipherText += 4 * Nb) {
#if AES_MODE == AES_MODE_CBC
        XorBytes(pCipherText, pIV, 4 * Nb);
#endif

        BlockEncrypt(pCipherText);
        pIV = pCipherText;
    }
}

//////////////////////////////////////////////////////////////////////////
//	��������	AES_Decrypt
//	������		��������
//	���������	pCipherText -- ���ģ�������ܵ����ݣ��䳤��ΪnDataLen�ֽڡ�
//				nDataLen	-- ���ݳ��ȣ����ֽ�Ϊ��λ������ΪAES_KEY_LENGTH/8����������
//				pIV			-- ��ʼ�����������ʹ��ECBģʽ������ΪNULL��
//	���������	pPlainText  -- ���ģ��������Ľ��ܺ�����ݣ�������pCipherText��ͬ��
//	����ֵ��	�ޡ�
//////////////////////////////////////////////////////////////////////////
void AES_Decrypt(unsigned char *pPlainText, const unsigned char *pCipherText,
                 unsigned int nDataLen, const unsigned char *pIV) {
    unsigned int i;

    if (pPlainText != pCipherText) {
        memcpy(pPlainText, pCipherText, nDataLen);
    }

    // �����һ�����ݿ�ʼ���ܣ��������ÿ��ٿռ�������IV
    pPlainText += nDataLen - 4 * Nb;
    for (i = nDataLen / (4 * Nb); i > 0; i--, pPlainText -= 4 * Nb) {
        BlockDecrypt(pPlainText);

#if AES_MODE == AES_MODE_CBC
        if (i == 1) {// ���һ������
            XorBytes(pPlainText, pIV, 4 * Nb);
        } else {
            XorBytes(pPlainText, pPlainText - 4 * Nb, 4 * Nb);
        }
#endif
    }
}


